将视图控制器添加到容器视图覆盖视图

Question

我已经尝试过以下大量示例以及SO上的其他questions。正在添加视图控制器，但它将视图容器放入视图而不是视图容器。这是我的意思。

我有主视图控制器和容器视图上的标签栏。当点击标签栏上的项目时，应该抓住控制器并将其加载到容器视图中。这是我如何做的代码。

@IBOutlet weak var tabBar: UITabBar! 
@IBOutlet weak var containerView: UIView! 
var currentViewController: UIViewController! 
var radarViewController: UIViewController! 

override func viewDidLoad() { 
    super.viewDidLoad() 

    // Do any additional setup after loading the view. 
    let storyboard = self.storyboard 
    let currentViewController = storyboard?.instantiateViewController(withIdentifier: "WeatherCurrentViewController") as! WeatherCurrentViewController 
    self.currentViewController = UINavigationController(rootViewController: currentViewController) 
    let radarViewController = storyboard?.instantiateViewController(withIdentifier: "WeatherRadarViewController") as! WeatherRadarViewController 
    self.radarViewController = UINavigationController(rootViewController: radarViewController) 
} 
func tabBar(_ tabBar: UITabBar, didSelect item: UITabBarItem) { 
    if item.tag == 1 { 
     containerView.addSubview(currentViewController!.view) 
     currentViewController.didMove(toParentViewController: self) 
    } 

    if item.tag == 2 { 
     containerView.addSubview(radarViewController!.view) 
     radarViewController.didMove(toParentViewController: self) 
    } 
} 

这是Swift 3.我不知道我做错了什么。任何帮助表示赞赏。

更新

虽然我从来没有得到的视图切换到许多变化/尝试后编程工作，我没有找到使用塞格斯多视图容器的另一种方式（here，不是理想的，因为它占用了更多的内存但它的工作原理。

Answer 1

视图控制器只是UIView周围的包装。所以最后你总会有控制器查看添加为一个子视图容器视图。

的这点是你仍然会得到所有的通知f或视图控制器，如旋转变化，布局...

我使用的类是UIView子类。它看起来是这样的：

import UIKit 

class ContentControllerView: UIView { 

    weak var parrentViewController: UIViewController? 
    private(set) var currentController: UIViewController? 

    func setViewController(controller: UIViewController) { 
     guard let parrentViewController = parrentViewController else { 
      print("ContentControllerView error: You need to set a parrentViewController to add a new view controller") 
      return 
     } 

     if controller.view != currentController?.view { 
      currentController?.willMove(toParentViewController: nil) // Notify the current controller it will move off the parent 
      controller.willMove(toParentViewController: parrentViewController) // Notify the new controller it will move to the parent 
      parrentViewController.addChildViewController(controller) // Add child controller 
      currentController?.view.removeFromSuperview() 
      currentController?.didMove(toParentViewController: nil) // Notify the current controller it did move off the parent 

      controller.view.translatesAutoresizingMaskIntoConstraints = false // Disable this to add custom constraints 
      self.addSubview(controller.view) // Add as subview 
      // Assign new constraints 
      self.addConstraint(NSLayoutConstraint(item: self, attribute: .left, relatedBy: .equal, toItem: controller.view, attribute: .left, multiplier: 1.0, constant: 0.0)) 
      self.addConstraint(NSLayoutConstraint(item: self, attribute: .right, relatedBy: .equal, toItem: controller.view, attribute: .right, multiplier: 1.0, constant: 0.0)) 
      self.addConstraint(NSLayoutConstraint(item: self, attribute: .top, relatedBy: .equal, toItem: controller.view, attribute: .top, multiplier: 1.0, constant: 0.0)) 
      self.addConstraint(NSLayoutConstraint(item: self, attribute: .bottom, relatedBy: .equal, toItem: controller.view, attribute: .bottom, multiplier: 1.0, constant: 0.0)) 

      self.layoutIfNeeded() 

      currentController?.removeFromParentViewController() // remove the current controller from parrent 
      controller.didMove(toParentViewController: parrentViewController) // Notify the new controller it did move to the parent 

      currentController = controller 
     } 
    } 

} 

视图可以在故事板加入，但随后在代码中，你需要的视图控制器分配：

self.contentControllerView.parrentViewController = self 
self.contentControllerView.setViewController(controller: controller)